Adjustable dumbbell



FIG. 1 is an exploded perspective view of an adjustable dumbbell showing my new design according to a first embodiment;

FIG. 2 is an exploded front view thereof;

FIG. 3 is an exploded back view thereof;

FIG. 4 is a right-side view thereof;

FIG. 5 is a left-side view thereof;

FIG. 6 is an exploded top view thereof;

FIG. 7 is an exploded bottom view thereof;

FIG. 8 is a perspective view thereof in an assembled position;

FIG. 9 is an exploded perspective view of an adjustable dumbbell showing my new design according to a second embodiment;

FIG. 10 is an exploded perspective view of an adjustable dumbbell showing my new design according to a third embodiment; and,

FIG. 11 is an exploded perspective view of an adjustable dumbbell showing my new design according to a fourth embodiment. 

CLAIM I claim the ornamental design for an adjustable dumbbell, as shown and described. 